Materials 2014, 7(4), 2631-2649; doi:10.3390/ma7042631
Article

Isothermal Time-Temperature-Precipitation Diagram for an Aluminum Alloy 6005A by In Situ DSC Experiments

1,2,* email, 1,2email, 1,3email and 2,3email
Received: 13 December 2013; in revised form: 27 January 2014 / Accepted: 24 March 2014 / Published: 28 March 2014
(This article belongs to the Special Issue Light Alloys and Their Applications)
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Abstract: Time-temperature-precipitation (TTP) diagrams deliver important material data, such as temperature and time ranges critical for precipitation during the quenching step of the age hardening procedure. Although the quenching step is continuous, isothermal TTP diagrams are often applied. Together with a so-called Quench Factor Analysis, they can be used to describe very different cooling paths. Typically, these diagrams are constructed based on mechanical properties or microstructures after an interrupted quenching, i.e., ex situ analyses. In recent years, an in situ calorimetric method to record continuous cooling precipitation diagrams of aluminum alloys has been developed to the application level by our group. This method has now been transferred to isothermal experiments, in which the whole heat treatment cycle was performed in a differential scanning calorimeter. The Al-Mg-Si-wrought alloy 6005A was investigated. Solution annealing at 540 °C and overcritical quenching to several temperatures between 450 °C and 250 °C were followed by isothermal soaking. Based on the heat flow curves during isothermal soaking, TTP diagrams were determined. An appropriate evaluation method has been developed. It was found that three different precipitation reactions in characteristic temperature intervals exist. Some of the low temperature reactions are not accessible in continuous cooling experiments and require isothermal studies.
Keywords: differential scanning calorimetry (DSC); aluminum alloy 6005A; isothermal time-temperature-precipitation diagram; TTP diagram
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MDPI and ACS Style

Milkereit, B.; Giersberg, L.; Kessler, O.; Schick, C. Isothermal Time-Temperature-Precipitation Diagram for an Aluminum Alloy 6005A by In Situ DSC Experiments. Materials 2014, 7, 2631-2649.

AMA Style

Milkereit B, Giersberg L, Kessler O, Schick C. Isothermal Time-Temperature-Precipitation Diagram for an Aluminum Alloy 6005A by In Situ DSC Experiments. Materials. 2014; 7(4):2631-2649.

Chicago/Turabian Style

Milkereit, Benjamin; Giersberg, Lydia; Kessler, Olaf; Schick, Christoph. 2014. "Isothermal Time-Temperature-Precipitation Diagram for an Aluminum Alloy 6005A by In Situ DSC Experiments." Materials 7, no. 4: 2631-2649.


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